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Ruins of Ruk’ifera’gina

Ok and sense I have completed my cavernous expeditions of the malign mushrooms, I'm now moving on to the next part of the adventure and maps. This would be the Ruins of an ancient eladrin city that has sunken beneath the earth.
I want to show that this place is connected to the Feywild as well, so if you guys see like vines and stuff you know why...which btw I need to find a png of vines running across the ground.
But any help you guys can offer please do, atm I'm really trying and not feeling vary successful.

Ok and in the begining...there was the entrance....
So this is the begining of the entrance and God did not cast any light on this...I'm not very happy with it and its still a WiP but there are numerous things that disappoint me. I'm tryin' to actually make the stone work look as if it where covered by dirt and stuff and patchy but for some reason I'm not doing a very good job at it.

Edit 1: Updated the Bridge looks like this is coming along more to what I want.
Edit 2: Added the northern section of the Entrance, still have some work to do though.
Edit 3: Updated Northern section of the Entrance and added the Complete Entrance map.

I think it looks fine except for the bright white bevel (might go for something grayer). For some dirt I can use a scatter brush in PS but I don't know if you have that in Gimp. So I'd think about making some general shapes for dirt patches, put some noise on that, blur the edges of the shapes to reduce sharpness, and then give it a color overlay...maybe some clouds for variation as well. But, again, I think it looks pretty good.

If the radiance of a thousand suns was to burst at once into the sky, that would be like the splendor of the Mighty One...I am become Death, the Shatterer of worlds.
-J. Robert Oppenheimer (father of the atom bomb) alluding to The Bhagavad Gita (Chapter 11, Verse 32)

actually that could work.
Duplicate the layer, run the mosiac filter (as random as possible).
Fill in the gaps with either black or white.
Then create another layer and bucket fill with 50/50 Grey.
Finally do a bump map of the mosiac layer.
Then delete mosiac layer and bam.
Ok that didn't work...however it did give the tiles more texture so tell me what you guys think.